JP2001010619A - Label-peeling device of label printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a label-peeling device of a label printer to realize the rotation in the forward and reverse directions of a peeling roller, prevent a continuous label body or a mount from being slackened during the back-feed operation, stably transfer and print the continuous label body, to peel a label, and reduce the cost. SOLUTION: In attention to the employment of a spring clutch inexpensive and easy in assembly in place of a bearing type one-way clutch, a peeling roller 7 is composed of a peeling roller shaft 23, peeling roller parts 24 to hold a continuous label body between the peeling roller and a driven roller, and a gear 16 for the peeling roller, and a coil spring 28 for a clutch is provided between the peeling roller shaft 23 and the gear 16 for the peeling roller to constitute a spring clutch 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a label peeling device for a label printer, and more particularly, to a label peeling device for a label printer for transferring a continuous label body in forward and reverse directions.

[0002]

2. Description of the Related Art A conventional label printer 1 will be outlined with reference to FIG. FIG. 5 is a schematic side view of the label printer 1. The label printer 1 includes a supply unit 3 for a label continuous body 2 and a thermal head 4 (print head).
, A platen roller 5, a deflecting turning member 6 such as a turning pin, a separating roller 7 and a driven roller 8
, A drive motor 9, an intermediate gear 10, an upstream label guide 11, and a downstream label guide 12.

The label continuum 2 has a configuration in which a plurality of labels 14 are temporarily attached to a band-shaped mount 13 (release paper). An intermediate gear 10 is provided between the platen roller gear 15 of the platen roller 5 and the peeling roller gear 16 of the peeling roller 7, and the platen roller 5 and the peeling roller 7 are driven in the same rotational direction by the drive motor 9. Can be driven.

In the label printer 1 having such a configuration, the platen roller 5 and the peeling roller 7 are driven to rotate via the intermediate gear 10 by driving the drive motor 9, and the label continuous body 2 is supplied from the upstream supply section 3 to the thermal head 4. The label 14 is peeled off by turning only the backing sheet 13 at the part of the turning-off member 6 for peeling, and the label 13 is peeled off. And discharge it.

The gear ratio between the platen roller gear 15 and the intermediate gear 10 is changed by changing the gear ratio between the platen roller gear 15 and the peeling roller gear 16. Gear ratio), the transfer length of the backing sheet by the separation roller 7 and the driven roller 8 on the downstream side is longer than the transfer length of the label continuous body 2 by the platen roller 5 on the upstream side. The label continuum 2 or the mount 13 thereof is not loosened at the roller 5, the peeling turning member 6, and the peeling roller 7.

In addition to the transfer and printing of the label continuous body 2 by the forward rotation of the platen roller 5 and the peeling roller 7 as described above, the drive motor 9 is rotated in the reverse direction to perform label printing without printing. In some cases, the body 2 is transported so as to be slightly returned to the upstream side, and an operation called a so-called back feed for adjusting the printing start position on the label 14 is performed. In the case of performing this back feed, the peeling roller 7 and the driven roller 8 increase the label continuous body 2 more in the reverse direction (upstream) than the platen roller 5 due to the difference in the gear ratio between the platen roller 5 and the peeling roller 7. (The side direction), the label continuum 2 or the backing sheet 13 in the front and rear portions of the peeling turning member 6 is loosened, which hinders printing on the label 14 during the next forward rotation and its peeling action. There is a problem that occurs.

Conventionally, a bearing type one-way clutch 17 or the like is provided on the peeling roller gear 16 so that the peeling roller 7 is driven in the same manner as the platen roller 5 when the driving motor 9 rotates forward, and the peeling roller 7 is rotated in the reverse rotation. 7, the rotation of the platen roller 5 is made rotatable so as not to transmit the rotational force so that only the platen roller 5 is rotatable to prevent the label continuous body 2 or the backing sheet 13 from becoming loose. There is.

The operation of the back feed is performed by using the label 14
Although there is an advantage that it is possible to save the printing area in the label printer 1, it is desirable to adopt this for the overall cost reduction in the operation of the label printer 1,
There is a problem that the use of the bearing type one-way clutch 17 increases the cost.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a label peeling apparatus for a label printer which can reduce the cost.

Another object of the present invention is to provide a label peeling device for a label printer having a structure capable of realizing forward and reverse rotation of a peeling roller instead of a bearing type one-way clutch.

Further, the present invention provides a label peeling apparatus for a label printer capable of preventing the occurrence of slack in a label continuous body or a backing sheet during back-feeding operation, stably transferring and printing a continuous label continuous body, and peeling off a label. The task is to provide.

[0012]

That is, the present invention provides a less expensive, one-way clutch instead of a bearing type one-way clutch.
It focuses on the use of a spring clutch that is easy to assemble, and provides a continuous label supply unit with multiple labels temporarily attached to a band-shaped backing paper, a print head that prints on the label, and a print head that prints the label. A platen roller for nipping and transferring the label continuity between the head, a peeling turning member for turning the mount, and a peeling roller and a driven roller for holding and transferring the turned mount. While having, a label peeling device of a label printer for transferring the label continuum from the supply unit in a predetermined transfer direction, and peeling the label from the mount, the peeling roller, a peeling roller shaft and A release roller portion for holding the label continuum between the driven roller and the driven roller, and a release roller gear. Provided clutch coil springs between the over shaft and the peeling roller gear, a label peeling unit for label printer, characterized in that to constitute a spring clutch.

The platen roller has a gear for the platen roller, an intermediate gear interposed between the gear for the platen roller and the gear for the peeling roller, and a gear for the platen roller and the intermediate gear. Can be made larger than the gear ratio between the peeling roller gear and the intermediate gear.

[0014] A drive motor for driving the platen roller and the peeling roller to be rotatable forward and backward may be provided.

A linear end of the coil spring for the clutch is fitted into an axially long window formed in the cylindrical portion of the gear for the peeling roller, and the coil body of the coil spring for the clutch is attached to the outer periphery of the peeling roller shaft. Can be fitted.

In the label peeling device of the label printer according to the present invention, since a spring clutch is employed in a part of the peeling roller, the label continuous body is not loosened at the time of normal and reverse rotation of the continuous label body, and the label is stable without any slack. Transfer and printing of the continuum, and peeling of the label are possible. Furthermore, the spring clutch is about 15 to 20 times less expensive than the bearing type one-way clutch, is easy to assemble, and enables back feed operation to save and effectively use labels in the label continuum. Thus, the cost can be reduced as a whole configuration of the label printer.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a label peeling apparatus for a label printer according to an embodiment of the present invention will be described with reference to FIGS. However, the same parts as those in FIG. 5 are denoted by the same reference numerals, and detailed description thereof will be omitted. FIG. 1 is a schematic side view of a label printer 20. The label printer 20 includes a supply unit 3, a thermal head 4, a platen roller 5, a peeling turning member 6, a peeling roller 7, and a label continuum 2 described above. It has a driven roller 8, a drive motor 9, an intermediate gear 10, an upstream label guide 11, a downstream label guide 12, and the like, and has a label peeling device 21.

The label peeling device 21 includes a turning member 6 for peeling.
And a separation roller 7 and a driven roller 8, and a spring clutch 22 provided on the separation roller 7.

FIG. 2 is an exploded perspective view of the peeling roller 7 and the spring clutch 22. FIG. 3 is a cross-sectional view of the spring clutch 22. FIG. FIG. 4 is a cross-sectional view, in which the peeling roller 7 has a peeling roller shaft 23, a peeling roller unit 24, and the peeling roller gear 16. As shown in FIG.
The right and left ends of the peeling roller shaft 23 are rotatably supported via a bare fight 26 (shaft supporting member) and an E-shaped snap ring 27 so that the peeling roller shaft 2
A gear 16 for a peeling roller and a coil spring 28 for a clutch are provided at one end of the third roller 3.

As shown in FIG. 3, the spring clutch 2
2 is constituted by the separation roller gear 16, the clutch coil spring 28, and the separation roller shaft 23. That is, the linear end 31 of the clutch coil spring 28 is fitted into the axially long window 30 formed in the cylindrical portion 29 of the peeling roller gear 16, and the coil body 32 of the clutch coil spring 28 is connected to the peeling roller shaft. 23. The arc-shaped end 33 (FIG. 4) of the coil spring 28 for the clutch is
It is in contact with the outer peripheral surface of the peeling roller shaft 23. Thus, the spring clutch 22 is provided between the peeling roller 7 and the intermediate gear 10.

In the label peeling device 21 and the spring clutch 22 having such a configuration, when the peeling roller gear 16 rotates forward (counterclockwise in the drawing), as shown in FIG.
The clutch coil spring 28 of the first embodiment bites the peeling roller shaft 23 and integrates the peeling roller shaft 23 and the peeling roller gear 16, so that the forward rotation driving force of the drive motor 9 is controlled by the intermediate gear 10 and the peeling roller gear. 16 is transmitted to the peeling roller section 24 via the clutch coil spring 28 and the peeling roller shaft 23, and the peeling roller 7 rotates in the forward direction together with the platen roller 5 to move the label continuous body 2 from the upstream side to the downstream side. The label is transferred, and printing on the label 14 and peeling of the label 14 are performed.

When the drive motor 9 is rotated in the reverse direction, the peeling roller gear 16 rotates clockwise in FIG. 4, and the clutch coil spring 28 is released from the state of being engaged with the peeling roller shaft 23. Since the urging force from the driven roller 8 acts on the peeling roller 7, this acts as a resistance, so that the peeling roller shaft 23, that is, the peeling roller portion 24 does not rotate, and only the platen roller 5 moves in the opposite direction. The label continuum 2 is rotated and driven to perform the back feed, and the label continuum 2 or the backing sheet 13 does not become loose on the upstream side and the downstream side of the peeling turning member 6.

Thus, the cost of the entire label printer 20 can be reduced by utilizing the characteristics of the back feed operation and the advantage of the low cost of the spring clutch 22. Further, the linear end 31 of the clutch coil spring 28 is fitted into an axial long window 30 formed in the cylindrical portion 29 of the peeling roller gear 16, and the coil main body 32 of the clutch coil spring 28 is removed from the peeling roller shaft. The spring clutch 22 can be assembled simply by being positioned on the outer periphery of the assembly 23, and the assembling workability is also good.

[0024]

As described above, according to the present invention, the separation roller is provided with the spring clutch instead of the conventional one-way clutch of the bearing type, so that the cost can be reduced and the back feed function can be realized. Can be.

[Brief description of the drawings]

FIG. 1 shows a label peeling apparatus 20 according to an embodiment of the present invention.
FIG. 1 is a schematic side view of a label printer 20 equipped with a.

FIG. 2 is an exploded perspective view of a peeling roller 7 and a spring clutch 22;

FIG. 3 is a cross-sectional view of the same part of the spring clutch.

FIG. 4 is a sectional view of a portion of the spring clutch 22 in a direction perpendicular to the axis.

FIG. 5 is a schematic side view of a conventional label printer 1.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 label printer (FIG. 5) 2 label continuum 3 label continuity 2 supply unit 4 thermal head (print head) 5 platen roller 6 turning member for peeling by turning pin 7 peeling roller 8 driven roller 9 drive motor 10 intermediate Gear 11 Upstream label guide 12 Downstream label guide 13 Backing paper (peeling paper) 14 Label 15 Platen roller gear 16 Peeling roller gear 17 Bearing type one-way clutch 20 Label printer (FIG. 1) 21 Label peeling device of label printer 20 (FIG. 1) Embodiment, FIG. 2) 22 Spring clutch 23 Peeling roller shaft 24 Peeling roller part 25 Left and right pair of brackets 26 Bear fight (shaft supporting member) 27 E-type snap ring 28 Clutch coil spring 29 Peeling roller Arc-shaped end of the coil body portion 33 clutch coil spring 28 of the straight end portion 32 clutch coil spring 28 in the axial direction length window 31 clutch coil spring 28 in the cylindrical portion 30 cylindrical portion 29 of the gear 16 (FIG. 4)

Claims (4)

[Claims] 1. A supply unit for a label continuum in which a plurality of labels are temporarily attached to a band-shaped mount, a print head for printing on the label, and the label continuity sandwiched between the print head. A platen roller for transferring, a peeling turning member for turning the backing sheet, a separating roller and a driven roller for nipping and transferring the turned backing sheet, and providing the label continuous body from the supply unit in a predetermined manner. The label peeling device of a label printer for transferring the label in the transfer direction, and peeling the label from the backing paper, the peeling roller, the peeling roller shaft, between the driven roller the label continuous body. A release roller portion to be sandwiched, and a release roller gear; and a clutch coil between the release roller shaft and the release roller gear. The spring is provided, label separation unit of a label printer, characterized in that to constitute a spring clutch. 2. The platen roller has a platen roller gear, an intermediate gear is interposed between the platen roller gear and the peeling roller gear, and the platen roller gear and the intermediate 2. The label peeling device for a label printer according to claim 1, wherein a gear ratio between the gear and the intermediate gear is larger than a gear ratio between the gear for the peeling roller and the intermediate gear. 3. The label peeling device for a label printer according to claim 1, further comprising a drive motor that drives the platen roller and the peeling roller to be rotatable forward and backward. 4. A linear end of the coil spring for a clutch is fitted into an axially long window formed in a cylindrical portion of the gear for the peeling roller, and a coil main body of the coil spring for a clutch is connected to the peeling roller shaft. The label peeling device for a label printer according to claim 1, wherein the label peeling device is fitted to an outer periphery of the label printer.